Chuck



(No Model.)

U. LEWIS;

CHUCK.

' No. 300,272. x Patented June 10,1884,

Unrrnn- H Srirrns PATENT ()rrrcn.

CHARLES LElViS, OF AMSTERDAM, NEW YORK, ASSlG'NdI-t TO DAVIS W. iSHEELER, OF SAME PLACE. I

CHUCK.

EPECIFICATIGN forming part of Letters Patent No. 300,272, dated June 10,1884.

T0 ctZZ whom it may concern: l Be it-known that I, (hmnrns Lnwrs, acitizen of the United States, residing at Amsterof New-York, haveinvented certain new and useful Improvements in Machines for TurningSpring-Heads; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin [o the art to which it appertains to make and use I p the same,reference being had to the accompap nying drawings, and to the lettersand-figures of reference 111 agked thereon,which form apart of thisspecification.

This invention relates to an improved chuck adapted to be used forholding the heads of flat or semi elliptic metal springs while beingturned in a lathe or other suitable machine; and it consistsin thepeculiar construction and arrangement of the parts of the chuck, as willbe hereinafter more fully described, and then specifically pointed outin the claims.

In" the annexed drawings, which illustrate the invention, Figure 1 is aperspective view of my improved chuck. Fig. 2 is a side view of thesame, showing a spring-head in place for turning. Fig. 3 is an elevationshowing the chuck mounted in a lathe, with the cut ting or finishingtool in position for turning the roughened headof a spring held in thechuck. Fig. 4 is a vertical section of the chuck on the line or zupfFig. 2. Fig. 5 is a perspective view of the steel-faced sliding plugused for holdingthe head of the spring in 5 place, and Fig. 6 is aperspective view of one end of a vehicle or other flat or semi-ellipticspring, showing one of the ears turned, and the other unturned or rough,as it appears at ter forging.

The letter A represents the chuck, which maybe made of cast metal orother suitable material, and is formed with transverse grooves orrecesses a aone on each side of the centei -as shown in Fig. 1'. 4.5 bis a radial groove or recess, enlarged and circular in shape, at thecenter of the chuck, and adapted to receive one end of the spring to beturned. The spring-head is held firmly in thegroove b by means of asteel-faced slidso ing plug, awhich plays verticallyin agroove dam, inthe county of Montgomery and State f in the chuck.

Application filed January 15, 1884. (No model.)

that forms a right-angled continuation of the groove 1). The plug 0extends'aeross the groove a, and enters a groove or recess,--d, in thechuck, as shown in Fig. 4. Into the npperend of the plug is screwed abolt or rod, 6, which extends 5 5 through an aperture in the recess d tothe outside of the chuck, and is surrounded with a spiral spring, a,that is held between the chuck and a head or pin on the end of the rodc. The other end of this plug 0 is semicircular in shape, 60. and isprovided with two shoulders, ff,adapt ed to rest on or press against theend 9 of the spring between the ears of the head. The plug 0 is alsoprovided with a slot, h, Fig. 5, through whichis passed awcdge orkey, i,by means of 6 5 which the plug is lowered or pressed down. This wedge tslides in the slot h, constantly bearing against the upper face of thegroove a in the chuck. A pin, j, passed through the narrow end of thewedge serves as a stop, and prevents the wedge from slipping out of theslot h when the plug is raised or withdrawn from the center. Itwill beobserved that when the key or wedge t is withdrawn the tension of thespring e raises the plug 0, so as to enable 7 5 the work to be removedand another piece inserted. The groove ct in the face of the chuck ismerely designed to balance the chuck and distribute its weightuniformly. I The operation of turning a roughened sprin head is asfollows: The head is inserted in the groove b, the plug 0 being firstraised by the accnlar end, fitting between the ears, and the 0 shouldersf f resting on the end 9 of the leaf.

Inthis way the spring-head is rigidly secured The leaf of the spring maybe further secured in the chuck, if desired, by a wedge and guardsecured to the outer end of 5 the groove 1), as shown in dotted lines inFig.

2. The tool rest or stand it (see Fig. 3) is then moved up to the head,the tool Z having been. adjusted in its standard, and the chuck is thenrevolved by means of pulleys or other suitable 10o means, the head ofthe spring of course revolving with the chuck,while the tool operatingon the head turns it smooth and true. By means of this chuck allspring-heads are turned uniform and require no centering before beingput into the machine.

Heretofore the head has been turned by extra finishing, as byemery-wheels, filing, and the like, or by inilling'tools; but this isexpensive, and when milling-tools are used they are liable to easily getout of repair, and it is also necessary that each head should becentered before being milled.

By means of my invention the centering of the heads is done away with,each head fitting in the same place and being operated upon by the toolevenly and uniformly, as before de- .scribed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters 20 Patent, isa r 1. In a machine for turningspring-heads, a rotary chuck provided with groovesa b, recess d, slidingplug 0, and key 2', substantially as described.

2. The conibination,with the chuck A, pro- 4 vided with a transversegroove, a, radial groove 1), having a circular enlargement at the endcoinciding with the center of the chuck, and the recess d, of thesliding plug 0, having slot 71, the rod 6, spring 6, andkey or wedge '5,sub- It is hereby certified that in Letters Patent No.300,272, granted.June 10, 1884, upon the application of Charles Lewis, of Amsterdam, NewYork, for an improvement in Chucks, the name of the assignee waserroneously written and printed Davis W. Sheelex; that said name shouldhave been written and printed Davis W. Shuler and that the propercorrection has been made in the files and. records pertaining to thecase in the Patent Office, and should be read in the Letters Patent tomake it conform thereto.

Signed, eountersigned, and sealed this 8th day of J uly, A. I). 1884.

[SEAL] M. L. JOSLYN,

Acting Secretary of the I ntcrior. Countersigned BENJ. BUTTERWORTH,

Commissioner of Patents.

